<template>
  <div class="app-container">
    <el-input v-model="filterText" placeholder="Filter keyword" style="margin-bottom:30px;"/>

    <el-tree
        ref="tree2"
        :data="data2"
        :props="defaultProps"
        :filter-node-method="filterNode"
        class="filter-tree"
        default-expand-all
    />

  </div>
</template>

<script>
import subject from "@/api/subject";

export default {

  data() {
    return {
      filterText: '',
      data2: [],
      defaultProps: {
        children: 'children',
        label: 'title'
      }
    }
  },
  watch: {
    filterText(val) {
      this.$refs.tree2.filter(val)
    }
  },

  created() {
    this.handleSelect()
  },
  methods: {
    handleSelect() {
      subject.getAllSubject().then(res => {
        this.data2 = res.data.list
      })
    },
    filterNode(value, data) {
      if (!value) return true
      return data.title.toLowerCase().indexOf(value.toLowerCase()) !== -1
    }
  }
}
</script>

